Host: Japan Association of Mineralogical Sciences
Horomanite and samaniite are found in the interstitial grains of olivine aggregate in lherzolite of the Horoman peridotite massif, Samani town, Hokkaido, Japan. The analytical data by EPMA for horomanite are Cu: 0.43, Fe: 41.82, Ni: 23.76, Co: 0.52 and S: 33.29, with a total of 99.52wt%. The empirical formula is (Fe5.77Ni3.12Co0.07Cu0.05)9.00S8.00. Crystal data by X-ray single crystal (precession) and powder diffractions for horomanite are tetragonal symmetry, a=10.566 , c=9.749 , and Z=4. The chemical compositions obtained by EPMA of samaniite are Cu:16.90, Fe:34.60, Ni:15.48, Co:0.16, and S:32.87 with total of 100.10wt%. The empirical formula is Cu2.08(Fe4.84Ni2.06Co0.02)6.92S8.00. The crystal data by X-ray single crystal and powder diffractions for samaniite are tetragonal symmetry, a=10.089, c=10.402, and Z=4.
